Dog heatstroke / overheating
A dog that is collapsed, very weak, or breathing hard with brick-red gums after heat or exercise is a medical emergency. Move them to shade or air conditioning, start gentle cooling with cool (not iced) water over the body, offer small sips if conscious, and head to a veterinarian immediately — call ahead. Heatstroke can damage the brain, kidneys and clotting within minutes, so cooling and the vet trip happen together. Flat-faced breeds, overweight, very young, old or thick-coated dogs are at higher risk.
Go to a vet now if
- Collapse, severe weakness, or unresponsiveness after heat or exercise
- Frantic or laboured panting, brick-red or bluish gums
- Vomiting or diarrhoea (sometimes bloody), drooling, wobbliness
- Seizures or trembling
Call a vet today if
- Heavy panting that settles quickly once cool, and the dog is otherwise normal
- Mildly less active on a hot day, recovering well in the shade
What to tell the vet
- How long your dog was hot or exercising
- Current breathing and consciousness
- What cooling you've started
- Gum colour
- Any vomiting, diarrhoea or seizures
- Breed, weight, age and conditions
What not to do
- Do not use iced or very cold water or ice baths — cool gradually to avoid shock
- Do not force water into a collapsed or unconscious dog
- Do not delay the vet trip while cooling — do both at once
What your vet may check
Your vet will measure core temperature, support breathing and circulation, give controlled cooling and fluids, and monitor for organ and clotting complications that can develop after the initial heat injury.
Recovery support after veterinary assessment
Heatstroke can affect organs even after the dog seems better, so monitoring matters. During recovery your vet may advise hydration and a gentle return to food; supportive options such as Alfavet ReConvales are used on veterinary advice once your dog is stable.
Frequently asked questions
What are the first signs of heatstroke in dogs?
Frantic panting, drooling, brick-red gums, wobbliness and vomiting. It can progress quickly to collapse and seizures, so begin cooling and head to a vet at the first signs.
How do I cool an overheating dog safely?
Move to shade or air conditioning, wet the body with cool (not iced) water, use a fan if available, offer small sips if conscious, and go to the vet. Avoid ice baths, which can cause shock.
My dog cooled down — do I still need a vet?
Yes. Heatstroke can cause internal damage that isn't visible at first, so a veterinary check after any heat collapse is the safe choice.
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Related emergency guides
Sources & standards
Emergency guidance follows AVMA, Merck Veterinary Manual, ASPCA Animal Poison Control, and small-animal emergency-medicine standards, reviewed by our veterinary advisory board.